title: Molecular dynamics simulations for CO2 spectra. IV. Collisional line-mixing in infrared and Raman bands.
abstract: Ab initio calculations of the shapes of pure CO2 infrared and Raman bands under (pressure) conditions for which line-mixing effects are important have been performed using requantized classical molecular dynamics simulations. This approach provides the autocorrelation functions of the dipole vector and isotropic polarizability whose Fourier-Laplace transforms yield the corresponding spectra. For that, the classical equations of dynamics are solved for each molecule among several millions treated as linear rigid rotors and interacting through an anisotropic intermolecular potential. Two of the approximations used in the previous studies have been corrected, allowing the consideration of line-mixing effects without use of any adjusted parameters. The comparisons between calculated and experimental spectra under various conditions of pressure and temperature demonstrate the quality of the theoretical model. This opens promising perspectives for first principle ab initio predictions of line-mixing effects in absorption and scattering spectra of various systems involving linear molecules.
authors.affiliation: Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS UMR 7583, Universités Paris Est Créteil et Paris Diderot, Institut Pierre-Simon Laplace, Université Paris Est Créteil, 94010 Créteil Cedex, France.
authors.forename: J
authors.initials: J
authors.lastname: Lamouroux
authors.forename: J-M
authors.initials: JM
authors.lastname: Hartmann
authors.forename: H
authors.initials: H
authors.lastname: Tran
authors.forename: B
authors.initials: B
authors.lastname: Lavorel
authors.forename: M
authors.initials: M
authors.lastname: Snels
authors.forename: S
authors.initials: S
authors.lastname: Stefani
authors.forename: G
authors.initials: G
authors.lastname: Piccioni
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D056004:Molecular Dynamics Simulation; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D002245:Carbon Dioxide